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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.query;

import com.google.inject.Inject;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
import org.apache.druid.java.util.metrics.AbstractMonitor;

import java.util.ArrayList;
import java.util.List;

public class ExecutorServiceMonitor extends AbstractMonitor
{

  private final List metricEmitters;
  private final ServiceMetricEvent.Builder metricBuilder;

  @Inject
  public ExecutorServiceMonitor()
  {
    this.metricEmitters = new ArrayList<>();
    this.metricBuilder = new ServiceMetricEvent.Builder();
  }

  public void add(MetricEmitter metricEmitter)
  {
    metricEmitters.add(metricEmitter);
  }

  @Override
  public boolean doMonitor(ServiceEmitter emitter)
  {
    for (MetricEmitter metricEmitter : metricEmitters) {
      metricEmitter.emitMetrics(emitter, metricBuilder);
    }
    return true;
  }

  public interface MetricEmitter
  {
    void emitMetrics(ServiceEmitter emitter, ServiceMetricEvent.Builder metricBuilder);
  }
}